One caveat: We do not prove God's existence (as per the title of the video below). The existence of God is evident through creation and the conscience. Atheists already know that God exists, but they "suppress the truth in unrighteousness" (Rom 1:18), because they do not want to repent of their sins and follow the Lord Jesus. As atheist Julian Huxley said, “The reason we accepted Darwinism even without proof, is because we didn’t want God to interfere with our sexual mores.”Sin is the ultimate reason why atheists reject God, not lack of proof of God's existence. That is the reason why they, as one atheist professor said, "cannot even allow a divine foot in the door". If they admit God's existence, then they will have to answer to Him. They do not want to be held accountable to God for their lives, though they will anyways. They cannot escape God's judgement (Hebrews 9:27).Pretending that God is not there, does not cause Him to cease to exist. He cannot cease to exist. God is eternal. See: There Is No God, Said The Fool.